Printable Hard Sudoku

Set 15gvimk. 8 puzzles with an answer key, ready to print.

Hard puzzles start with about 29 givens and need real techniques: pointing pairs, naked pairs and hidden pairs. Paper is a great way to practice them, because you have to keep your own notes honest.

Each free PDF has 8 puzzles, four to a page on US Letter paper, plus an answer key with every solution. Every puzzle has exactly one solution. A new set appears here every day, or you can grab a different set any time.

Puzzles in this set

Hard #1
5 6 2
2 3 4 6
9 6 8 5
7
4 6 8
7 2 3 4
3 8 7
2 8 4 6 5
9 8
Hard #2
5 3 2 9
8 1 4 5
4 8
3 4 9 1
5 7 6
7 5 6
8 6 4
1 7
6 9 3 8
Hard #3
6 1
9 3 8 7
1 3 5
6 5 9 1
6 8 5
2 6 8
8 5 2
3 4 1 7
6 7 8
Hard #4
4 3
6 4
5 2 4 3
1
2 4 5 1 9
1 6 7 5
6 2 7 5
1 5 6
5 9 3 4
Hard #5
8 3 4 5
1 7 8
2 5
9 7
4 9 6 3
2 5 3 8
6 7 3 9
7 6
9 4 1 3
Hard #6
1 5 3 2
2 7 1
3
3 4 9
1 4 8
9 5
6 8 4 7
3 5 8 1
7 2 8 6 4
Hard #7
7
7 3 9
4 2 6 5 1
5 9 1 8 7
6 7 3
8 2 3 5 4
5 7 6 8
6 5 1
Hard #8
8 5 4
9 1 3
4 2 8 5
9 2 4
2 9 4 3
6 7
3 9
2 5 6 1
8 7 5 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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